interface Computable{
   int MAX = 46;
   int f(int x);
}
 class China implements Computable{
   int number;
   public int f(int x){
      int sum = 0;
      for(int i=0;i<=x;i++){
         sum = sum + i;
      }
      return sum;
   }
}
class Japan implements Computable {
   int number;
   public int f(int x){
      return MAX + x;
   }
}
public class Example6_1{
   public static void main(String args[]){
      China zhang ;
      Japan  henlu;
      zhang = new China ();
      henlu = new Japan ();
      zhang.number = 32+Computable.MAX;
      henlu.number = 14+Computable.MAX;
      System.out.println("zhang的学号"+zhang.number+",zhang求和结果"+zhang.f(100));
      System.out.println("henlu的学号"+henlu.number+",henlu求和结果"+henlu.f(100));
   }
}















